High spectral resolution measurement of gamma ray lines from the earth's atmosphere

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Radiation, Earth Atmosphere, Gamma Rays, Heao 3, Line Spectra, Satellite Observation, Gamma Ray Spectrometers, High Resolution, Satellite-Borne Instruments, Spectral Resolution

Scientific paper

A search for gamma ray line features from the earth's atmosphere has been conducted using data from the third High Energy Astronomy Observatory (HEAO 3) high spectral resolution gamma ray spectrometer. In addition to the strong line at 0.511 MeV, other intrinsically broadened line features have been observed at 1.63, 2.31, 3.67, 4.43, 5.09, and 6.13 MeV. Since the spectral resolution of the instrument is much finer than the width of the observed line features, the intrinsic width as well as the energy and intensity of each of these lines are reported. Several other predicted lines have also been observed. The characteristic of the lines seen by HEAO 3 are generally consistent with theoretical predictions as well as with previous measurements.

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